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The inner core is 5100 to 6378km.
Earths mantle is mainly composed of substances high in iron and magnesium. The melting point of every substance depends on the pressure and the deeper we go the higher the pressure becomes. Because of this the upper mantle is said to be semi-molten and the lower mantle solid. The upper mantle iron-substances are semi-molten because it is hot and they are under little pressure, lower mantles iron-substances are solid because they are under a lot of pressure. The mantle is 35 to 2890km.
Earths crust ranges from 5 to 70 km in depth. The thinnest parts are the oceanic crust made of dense iron magnesium silicate rocks and underlie the ocean basins...
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